MCQs of Atoms

Atoms MCQs

Showing 111 to 120 out of 146 Questions

111.

The ratio of maximum wavelength of the Lyman series in hydrogen spectrum to maximum wavelength in Paschen series is _____ .

(a)	$\frac{3}{105}$
(b)	$\frac{6}{15}$
(c)	$\frac{52}{7}$
(d)	$\frac{7}{108}$

112.

The energy of an atom (or ion) in its ground state is 54.4 eV. It may be _____.

(a)	hydrogen
(b)	deuterium
(c)	He⁺⁺
(d)	Li⁺⁺

113.

The energy of an electron in an excited hydrogen atom is -3.4 eV. Its angular momentum according to Bohr's theory will be _____.

(a)	2.11 × 10^-34J s
(b)	2.11 × 10⁺³⁴J s
(c)	2.11 × 10^-34ergs
(d)	zero

114.

If the difference of energies of an electron in the second and the fourth orbits of an atom is E, then the ionization energy of that atom will be _____ .

(a)	$\frac{36}{5} E$
(b)	$\frac{16}{3} E$
(c)	$\frac{5}{36} E$
(d)	$\frac{3}{16} E$

115.

The wavelength of first lines of Balmer series of hydrogen, He⁺ and Be³⁺ are λ₁, λ₂ and λ₃ respectively. The ratio of these wavelengths will be _____ .

(a)	1 : 4 : 16
(b)	1 : 2 : 4
(c)	16 : 4 : 1
(d)	4 : 2 : 1

116.

The wavelength of first line of Lyman series in hydrogen atom is 1216 Å. The wavelength of first line of Lyman series for 10 times ionized sodium atom will be _____.

(a)	1000 Å
(b)	100 Å
(c)	10 Å
(d)	0.10 Å

117.

The first excitation potential of an atom is V. Its ionization potential will be _____ .

(a)	$\frac{1}{4} V$
(b)	$\frac{3}{4} V$
(c)	$\frac{4}{3} V$
(d)	$\frac{5}{4} V$

118.

If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li⁺⁺ is _____.

(a)	122.4 eV
(b)	30.6 eV
(c)	13.6 eV
(d)	3.4 eV

119.

Which of the following is not affected by electro-magnetic fields _____ .

(a)	α - rays
(b)	β - rays
(c)	X - rays
(d)	cathode-rays

120.

K_α characteristic X-rays refers to the transition from _____ .

(a)	n = 2 to n = 1
(b)	n = 3 to n = 2
(c)	n = 3 to n = 1
(d)	n = 4 to n = 2

Showing 111 to 120 out of 146 Questions